Perhaps you should try some spelling variations:
thuat tach » thuat sach, thuat mach, thuat tac
doanh phan » doanh nhan, doan phan, doanh thanh
hoc thuat » hoc thuyet, hoc thuc, hoc chat
cong dan » cong san, cong tan, huong dan
dan hang » ban hang, van hang, dat hang
dan phan » doan phan, dan chan, van phan

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc thuat tach - thanh cong dan hang thuong ((dan phan) or (doanh phan)) lap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thuat tach - thanh cong dan hang thuong ((dan phan) OR (doanh phan)) lap*.